Commissioning; Ignition Preparation; Initial Start-Up; De-Aeration Cycle - Ariston Clas 24 FF Installation And Servicing Instructions

commissioning

Initial Preparation
MTS (GB) Limited support the
information pack you will fi nd a copy of the
It is important that this is completed in the presence of your
customer, they are shown how to use it, and it is signed by them.
Please instruct your customer that they must have their
log book with them whenever they contact a service engineer or
us.
Preliminary electrical system checks to ensure electrical safety
must be carried out by a competent person i.e. polarity, earth
continuity, resistance to earth and short circuit.
Filling the Heating System:
Lower the control panel and remove the case panels.
Open the central heating fl ow and return cocks supplied with
the connection kit (there are two isolation points on the return
connection).
Unscrew the cap on the automatic air release valve one full turn
and leave open permanently.
Close all air release valves on the central heating system.
Gradually open valve(s) at the fi lling point (fi lling-loop) connection
to the central heating system until water is heard to fl ow, do not
open fully.
Open each air release tap starting with the lowest point and close
them only when clear water, free of air, is visible.
Purge the air from the pump by unscrewing the pump plug
anticlockwise, also manually rotate the pump shaft in the direction
indicated by the pump label to ensure the pump is free.
Refi t the pump plug.
Continue fi lling the system until at least 1.5 bar registers on the
pressure gauge.
Inspect the system for water soundness and remedy any leaks
discovered.
Filling of the D.H.W. System (COMBI only):
Close all hot water draw-off taps.
Open the cold water inlet cock supplied with the connection kit.
Open slowly each draw-off tap and close them only when clear
water, free of bubbles, is visible.
Gas Supply:
Inspect the entire installation including the gas meter, test for
tightness and purge the supply as described in BS 6891:1988.
Open the gas cock (supplied with the connection kit) to the
appliance and check the gas connections on the appliance for
leaks.
Flushing Procedure
When the installation and fi lling are completed, fl ush the system
while cold, refi ll, turn on the Central Heating system and run it until
the temperature has reached the boiler operating temperature.
The system must then be immediately fl ushed through.
The fl ushing procedure must be in line with BS 7593:1992 code
of practice for treatment of water in domestic hot water central
heating systems.
During this operation, we highly recommend the use of a central
heating fl ushing detergent (Fernox Superfl oc or equivalent),
whose function is to dissolve any foreign matter that may be in
the system.
Substances diff erent from these could create serious problems to
the pump or other components.
The use of an inhibitor in the system such as Fernox MB-1 or
equivalent is strongly recommended to prevent corrosion (sludge)
28
damaging the boiler and system.
initiative. Within the
Failure to carry out this procedure may invalidate the appliance
logbook.
warranty.

Initial Start-up

The checks to be run before initial start-up are as follows:
1. Make sure that:
2. Make sure that all radiator valves are open;
3. Check the minimum and maximum burner pressure values;
- the cap on the automatic air valve has been loosened
when the system is full;
- If the water pressure in the system is below 1.5 bar, bring it
up to the appropriate level;
- Make sure that the electrical connection has been made
properly and that the earth wire is connected to an
effi cient earthing system;
- Switch on the boiler (by pressing the ON/OFF button) and
select the standby mode, where no hot water or heating
requests are made.
- Start the deaeration cycle by pressing E
The boiler will start a deaeration cycle lasting about 7
minutes. If you need to stop it press E
- Loosen the cap on the head of the pump to eliminate any
air pockets;
- Repeat the procedure for bleeding the radiators of air;
- Open the hot water taps for a brief period;
- Check the system pressure and, if it has dropped, open the
fi lling loop again to bring the pressure back up to 1.5 bar.
adjust if necessary using the values indicated in the table on
Page 29.
Description of Function

De-aeration cycle

During the fi lling stage or if there is excess air in the system, the
deaeration cycle can be activated by holding the E
seconds. The boiler will start a cycle which lasts approximately 7
minutes. When this is complete the menu screen will be restored.
The cycle may either be repeated, if necessary, or stopped by
pressing E . Press the E button until the normal display screen
SC SC
is restored.
for 5 seconds
SC
.
SC
button for 5
SC